Di- and mono-alkoxysilane functionalized polymers and their application in the Bayer process
View Patent ↗Diallcoxysilane and monoalkoxysilane functionalized polymers were applied as scale control agents in Bayer process. The polymer inhibitors reduced the quantity of aluminum silicate scale formed in spent liquor while significantly changed the morphology of the scale. Also a method is provided for reducing aluminum silicate scale of Bayer process by adding the dialkoxysilane and monoalkoxysilane functionalized polymer into the Bayer liquor stream.
1. A composition comprising:
a polymer having pendant thereto a group or end group containing Formula I:
where n is an integer of either 1 or 2;
n+z=3;
R 1 is one item selected from the list consisting of: H, C 1 -C 12 Alkyl, Aryl, Na, K, Li, and NH 4 ; and
J is selected from the group consisting of H and a hydrocarbon group having a number of carbons within the range of 1 to 20 carbons; and
a Bayer liquor comprising silica.
2. The composition of claim 1 wherein the polymer comprises a recurring unit of the Formula II and a recurring unit of the Formula III:
wherein:
A 1 and A 2 are each an independent hydrocarbon group having a number of carbons within the range of 1 to 20 carbons or A 1 and A 2 are each independently a direct bond between the nitrogen atom and the adjoining group;
T and E are each an independent hydrocarbon group having a number of carbons within the range of 2 to 40 carbons; and
Q is selected from the group consisting of H and a hydrocarbon group having a number of carbons within the range of 1 to 20 carbons where:
the molecular weight of the polymer is at least 500; and
Q does not contain a silane group.
3. The composition of claim 1 wherein the polymer is according to formula IV:
where
x=0.5-20% and y=99.5-80%.
4. The composition of claim 1 wherein the polymer is according to formula V:
where
x=0.5-20% and y=99.5-80%.
5. The composition of claim 1 wherein the polymer is according to formula VI:
where
x=1-99%, y=1-99%, and z=0.5-20%;
M is selected from the list consisting of Na, K, Li, and NH 4 .
6. The composition of claim 1 wherein the polymer is a graft copolymer of formula VII and formula VIII:
where
x=0.1-99% (as a percentage of small molecule units in the polymer); and
X is NH, NR′, or O;
R′=C 1 -C 10 alkyl, or aryl.
7. The composition of claim 1 wherein the polymer is a graft copolymer of formulas IX and X:
8. The composition of claim 1 wherein the polymer is one selected from the list consisting of: bis [(3-alkyl-dialkoxysilylpropyl)]polypropyleneoxide, bis [(3-alkyl-dialkoxysilylpropyl)]polyethyleneoxide, and any combination thereof.
9. The composition of claim 1 wherein the polymer is bonded to at least a portion of the silica of the Bayer liquor.
10. A composition comprising:
a polymer having pendant thereto a group or end group containing Formula I:
where
n is an integer of either 1 or 2;
n+z=3;
R 1 is one item selected from the list consisting of: H, C 1 -C 12 Alkyl, Aryl, Na, K, Li, and NH 4 ; and
J is selected from the group consisting of H and a hydrocarbon group having a number of carbons within the range of 1 to 20 carbons; and
an amount of a silicon-comprising foulant.
11. The composition of claim 9 wherein the polymer comprises a recurring unit of the Formula II and a recurring unit of the Formula III:
wherein:
A 1 and A 2 are each an independent hydrocarbon group having a number of carbons within the range of 1 to 20 carbons or A 1 and A 2 are each independently a direct bond between the nitrogen atom and the adjoining group;
T and E are each an independent hydrocarbon group having a number of carbons within the range of 2 to 40 carbons; and
Q is selected from the group consisting of H and a hydrocarbon group having a number of carbons within the range of 1 to 20 carbons where:
the molecular weight of the polymer is at least 500; and
Q does not contain a silane group.
12. The composition of claim 10 wherein the polymer is according to formula IV:
where
x=0.5-20% and y=99.5-80%.
13. The composition of claim 10 wherein the polymer is according to formula V:
where
x=0.5-20% and y=99.5-80%.
14. The composition of claim 10 wherein the polymer is according to formula VI:
where
x=1-99%, y=1-99%, and z=0.5-20%;
M is selected from the list consisting of Na, K, Li, and NH 4 .
15. The composition of claim 10 wherein the polymer is a graft copolymer of formula VII and formula VIII:
where
x=0.1-99% (as a percentage of small molecule units in the polymer); and
X is NH, NR′, or O;
R′=C 1 -C 10 alkyl, or aryl.
16. The composition of claim 10 wherein the polymer is a graft copolymer of formulas IX and X:
17. The composition of claim 10 wherein the polymer is one selected from the list consisting of: bis [(3-alkyl-dialkoxysilylpropyl)]polypropyleneoxide, bis [(3-alkyl-dialkoxysilylpropyl)]polyethyleneoxide, and any combination thereof.
18. The composition of claim 10 wherein the polymer is bonded to at least a portion of the amount of the silicon-comprising foulant.